Cobble imbrication as a sensitive indicator of subtle local changes in river flow direction

Research Article| July 01, 1981 Cobble imbrication as a sensitive indicator of subtle local changes in river flow direction Marvin E. Kauffman; Marvin E. Kauffman 1Franklin and Marshall College, Lancaster, Pennsylvania 17604 Search for other works by this author on: GSW Google Scholar Dale F. Ritter Dale F. Ritter 2Southern Illinois University, Carbondale, Illinois 62901 Search for other works by this author on: GSW Google Scholar Author and Article Information Marvin E. Kauffman 1Franklin and Marshall College, Lancaster, Pennsylvania 17604 Dale F. Ritter 2Southern Illinois University, Carbondale, Illinois 62901 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1981) 9 (7): 299–302. https://doi.org/10.1130/0091-7613(1981)9<299:CIAASI>2.0.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Marvin E. Kauffman, Dale F. Ritter; Cobble imbrication as a sensitive indicator of subtle local changes in river flow direction. Geology 1981;; 9 (7): 299–302. doi: https://doi.org/10.1130/0091-7613(1981)9<299:CIAASI>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Imbrication of cobbles in Pleistocene terrace gravels along the Shoshone River near Powell, Wyoming, shows significant changes in orientation from a lower set to an upper set within a gravel layer. The lower gravels show a mean orientation of 126°, with spreads from s = 38° to s = 56°. The mean orientation of the upper gravels is 070°, with spreads from s = 19° to s = 26°. Change from the lower to the upper deposit is abrupt, with no noticeable variability near the contact. In fact, the contact can easily be overlooked without close scrutiny of the cobble fabric. This suggests that cobble imbrication may be a sensitive indicator of subtle changes in the flow direction of a braided stream. Because the earlier fabric was not disturbed by deposition of the younger unit, there is every reason to believe that such fabrics can and will be preserved even in the consolidated rock record and can be used for paleoenvironmental interpretations. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.